Finding the Fourth Proportional to 1,222.24, 1,686.24 and 808

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.24 : 1,686.24 = 808 : x
2. Step 2: Convert to fraction form
   1,222.24/1,686.24 = 808/x
3. Step 3: Cross multiply
   1,222.24x = 1,686.24 × 808
4. Step 4: Simplify right side
   1,222.24x = 1,362,481.92
5. Step 5: Solve for x
   x = 1,362,481.92/1,222.24
6. Step 6: Final answer
   x = 1,114.74